*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
/* 导航部分 */
.nav ul{
    background-color: rgb(49, 49, 49);
}
.nav ul > li a{
    margin: 0 30px;
    display: block;
    height: 50px;
    line-height: 50px;
    width: 100%;
    text-decoration: none;
    font-size: 24px;
    font-weight: 500;
    text-align: center;
}
.nav ul > li a:hover{
    background-color: #f4511e;
}
img{
    width: 100vw;
    height: 300px;
}
.hd{
    position: absolute;
}
.hd ul > li{
    /* float: left; */
    top: 300px;
    right: 500px;
    position: relative;
    color: #f4511e;
}